Bootstrap AOT: minimal namespace support (closes #513)

[PurHur]

Summary

• Compile PHPCfg\Op\Expr\NsFuncCall using the fully-qualified nsName operand for function lookup (definitions already use namespacedName from php-cfg).
• Add patches/php-types-ns-func-call.patch so TypeReconstructor resolves namespaced calls.
• Add test/bootstrap-aot/namespace_hello.php and register it in the bootstrap profile / AOT lint ladder.

Progresses #513 (self-host namespace gate) and #84 (PHP namespaces). Single file, single namespace, no use imports.

Test plan

• docker run --rm -m 10g -v $(pwd):/compiler -w /compiler php-compiler:22.04-dev bash -c 'source script/ci-defaults.env && php bin/compile.php -l test/bootstrap-aot/namespace_hello.php'
• php script/bootstrap-aot-lint.php (6 targets)

Still blocking full lib/ self-host (#84)

• use / import aliases and multi-file PSR-4 autoload
• Namespaced classes, constants, and namespace blocks without hoisted functions
• Compiling lib/*.php units that mix namespaces with classes, traits, etc.

Closes #513
Refs #84

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